Pls help to solve this question, thank you in advance.

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secondary 3 | A Maths
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secondary 3 A Maths Singapore

Pls help to solve this question, thank you in advance.

Date Posted: 2 years ago

done {{ upvoteCount }} Upvotes

clear {{ downvoteCount * -1 }} Downvotes

for question (b)
try
cos4θ=cos(2*2θ)

Date Posted: 2 years ago